Genetic structure and parasite compatibility of Bulinus globosus (Gastropoda: Planorbidae) from two areas of different endemicity of Schistosoma haematobium in Zimbabwe

A comparative study of the genetic structure of 8 populations of B. globosus from 2 areas of different endemicity of Schistosoma haematobium was done. Five populations were from Chiweshe (high endemicity) and three were from Plumtree (low endemicity). Genetic structure, as determined by allozyme gen...

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Bibliographic Details
Published in:International journal for parasitology 1996-03, Vol.26 (3), p.269-280
Main Authors: Mukaratirwa, S., Siegismund, H.R., Kristensen, T.K., Chandiwana, S.K.
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Bulinus - genetics
Bulinus - parasitology
Bulinus globosus
compatibility
Disease Reservoirs
Freshwater
Fundamental and applied biological sciences. Psychology
Gene Frequency
gene pools
Genetic structure
Genetic Variation
Host-Parasite Interactions
Humans
Medically important nuisances and vectors, pests of stored products and materials: population survey and control
Phylogeny
Prevalence
Schistosoma haematobium
Schistosoma haematobium - physiology
Schistosomiasis haematobia - epidemiology
Species Specificity
Vectors. Intermediate hosts
Zimbabwe
Zimbabwe - epidemiology
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Summary:A comparative study of the genetic structure of 8 populations of B. globosus from 2 areas of different endemicity of Schistosoma haematobium was done. Five populations were from Chiweshe (high endemicity) and three were from Plumtree (low endemicity). Genetic structure, as determined by allozyme genetics, revealed high levels of genetic variability in Chiweshe populations ( H o = 0.12–0.26) and low levels in Plumtree ( H o = 0.06–0.12). Populations from Chiweshe were genetically heterogeneous whereas in Plumtree the populations were uniform. There were significant deviations from Hardy-Weinberg proportions at different loci in Chiweshe populations. The observed excess of homozygotes was probably caused by partial selfing. The compatibility studies showed variation between allopatric and sympatric combinations of snails and parasites, and the Plumtree parasite had a significant influence on the compatibility parameters. This strain had a positive correlation ( P < 0.01) of its infection rate with allele frequency of Est-2 100 and a negative correlation ( P < 0.05) with allele Idh 100.
ISSN:0020-7519
1879-0135
DOI:10.1016/0020-7519(95)00130-1